package thread3;

public class Demo15 {
    private static Object locker = new Object();

    public static void func1() {
        synchronized (locker) {
            func2();
        }
    }

    public static void func2() {
        func3();
    }

    public static void func3() {
        func4();
    }

    public static void func4() {
        synchronized (locker) {

        }
    }


    public static void main(String[] args) {

    }
}
